Claim Missing Document
Check
Articles

Found 25 Documents
Search

Studi Teoretis Struktur Elektronik dan Sifat Transisi Spin Kompleks [Fe(dpa)2(NCS)2] Yusthinus Thobias Male; Djulia Onggo; Muhamad Abdulkadir Martoprawiro; Ismunandar Ismunandar
Jurnal Matematika & Sains Vol 14, No 3 (2009)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The computational method B3LYP*/6-31G(d) has been used for predicting the mononuclear spin transition (ST) complexes properties, i.e. [Fe(dpa)2(NCS)2] with cis and trans isomers. Computational results showed that in vacuum and methanol, cis-[Fe(dpa)2(NCS)2] isomer gave a reasonable value of ∆Eel for ST. In methanol, the cis isomer was more stabilized because that isomer showing more higher dipole moments (21,59 D) than the trans isomer and unsubstituted complex, [Fe(dpa)3]2+ (5,70 and 0,03 D). This results showed that if those complexes were synthesized, in the ambient temperature they have high spin properties but only cis-[Fe(dpa)2(NCS)2] isomer has ST properties. Analysis of main atomic orbitals populations showed that the electronic ground bands and the next ground bands are assigned to ligand-to-ligand charge-transfer (LLCT) transitions because of the charge transfer from NCS-ligand to the main ligand. It can be concluded that computational method B3LYP*/6-31G(d) gives more predictive power to mononuclear ST complex.
ANALISIS KANDUNGAN FORMALIN PADA MIE BASAH PADA BEBERAPA LOKASI DI KOTA AMBON Male, Yusthinus T; Letsoin, Lina I; Siahaya, Netty A
Majalah BIAM Vol 13, No 2 (2017): Majalah BIAM
Publisher : Balai Riset dan Standardisasi Industri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.739 KB) | DOI: 10.29360/mb.v13i2.3530

Abstract

Telah dilakukan penelitian untuk menganalisis kandungan formalin mie basah pada beberapa lokasi di Kota Ambon. Tujuan dari penelitian ini adalah untuk menentukan kandungan formalin pada mie basah. Penelitian ini menggunakan tiga tahap pengujian. Pada tahap awal, dilakukan uji fisik dan analisis kualitatif untuk  menentukan ada tidaknya formalin dan analisis kuantitatif digunakan untuk menentukan kadar formalin dalam mie basah. Dari pengamatan uji fisik, ditemukan dua dari empat belas sampel mie basah mengandung formalin  yaitu sampel J (Batu Merah) dan K (Mardika) karena tetap awet sampai tiga hari. Analisis kualitatif dengan pereaksi asam kromatofat tidak menunjukkan perubahan warna yang khas. Pada pengamatan uji fisik mie basah dua sampel yang mengandung formalin dilanjutkan dengan analisis kuantitatif menggunakan Spektrofotometri UV-Vis pada panjang gelombang 520 nm. Kadar formalin untuk sampel J (Batu Merah) sebesar 9,07 mg/kg dan sampel K (Mardika) sebesar 10,01 mg/kg. Sesuai syarat mutu mie basah pada SNI 01-2987-1992, mie basah tidak boleh mengandung formalin.
PREDIKSI POTENSI ANTIKANKER SENYAWA TURUNAN XANTHON MENGGUNAKAN HUBUNGAN KUANTITATIF STRUKTUR DAN AKTIVITAS (HKSA) Male, Yusthinus; Sutapa, I Wayan; Pusung, Yulian A. D.
CHEMISTRY PROGRESS Vol 11, No 1 (2018)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.11.1.2018.27907

Abstract

ABSTRAK Telah dilakukan penelitian untuk memprediksi potensi antikanker senyawa turunan xanthon menggunakan hubungan kuantitatif struktur dan aktivitas (HKSA) (Quantitative Structure Activity Relationship-QSAR) dengan deskriptor elektronik berupa muatan bersih atom, momen dipol, polarisabilitas, energi HOMO-LUMO, dan Log P yang dihitung menggunakan metode semi empirik PM3. Hasil analisis HKSA menunjukan bahwa model persamaan HKSA terbaik adalah Log IC50 = 18,730 + (-1,042.qC1) + (1,633.qC2) + (3,369.qC3) + (1,257.qC4) + (29,759.qC8) + (53,543.qC9) + (2,337.qC10) + (-0,161.momen dipol) + (1.550.Ehomo) + (-2,919.Elumo) +(0,140.Polarisabilitas) + (0.892. Log P) (n=27; r=0,997; r2=0,993; SE=0,08530; Fhitung/Ftabel=9,1588; PRESS= 50,04021). Penelitian ini menunjukkan bahwa pusat aktif senyawa turunan xanthon terletak pada atom karbon C1, C2, C3, C4 C8, C9 dan C10 sehingga modifikasi substituen pada posisi-posisi ini akan memberikan dampak signifikan terhadap aktifitas antikanker senyawa turunan xanthon  ABSTRACT The research has been done to predict anti cancer potential of xanthon derivative compounds using Quantitative Structure Activity Relationship (QSAR) with electronic descriptor such as : atomic net charge, dipole moment, polarizability, HOMO-LUMO energy and Log P were calculated by semi-empirical PM3 method. The best QSAR model equation were determined from analysis of multiple linear regression. The result of QSAR analysis shows that best QSAR model equation is Log IC50 = 18,730 + (-1,042.qC1) + (1,633.qC2) + (3,369.qC3) + (1,257.qC4) + (29,759.qC8) + (53,543.qC9) + (2,337.qC10) + (-0,161.momen dipol) + (1.550.Ehomo) + (-2,919.Elumo) +(0,140.Polarisabilitas) + (0.892. Log P) (n=27; r=0,997; r2=0,993; SE=0,08530; Fcal/Ftable=9,1588; PRESS= 50,04021). This research also shows that active site of the xanthon derivatives is located on carbon atom C1, C2, C3, C4 C8, C9 and C10 so that the modification of the substituents in these positions will have a significant impact on the anticancer activity of xanthon derivatives. 
ANALISIS KANDUNGAN MERKURI (Hg) PADA PADA EKOSISTEM SUNGAI WAELATA DAN SUNGAI ANAHONI YANG TERDAMPAK AKTIFITAS PERTAMBANGAN EMAS DI PULAU BURU, MALUKU ., Irsan; Male, Yusthinus T.; Selanno, Debby A. J.
CHEMISTRY PROGRESS Vol 13, No 1 (2020)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.13.1.2020.29062

Abstract

Sungai Waelata dan Sungai Anahoni merupakan dua sungai tempat beroperasinya trommel untuk pengolahan material emas Gunung Botak dan Gogrea. Melalui aliran sungai, limbah merkuri hasil pengolahan trommel terangkut dan terbawa ke muara yang pada akhirnya akan mencemari perairan laut Teluk Kayeli. Kerang Polymesoda erosa merupakan salah satu jenis kerang yang sering digunakan dalam pemantauan logam berat merkuri, terutama pada wilayah muara sungai. Penelitian ini bertujuan untuk menganalisis kadar logam berat merkuri(Hg) pada air, sedimen dan kerang Polymesoda erosadi Muara Sungai Waelata dan Sungai Anahoni Kabupaten Buru. Hasil penelitian menunjukan konsentrasilogamberat merkuripada air di Muara Sungai Waelata dan Sungai Anahoni tidak terdeteksi di semua stasiun penelitian dan dibawah baku mutu air laut untuk biota laut berdasarkan Kepmen LH No. 51 Tahun 2004 sebesar 0,001 ppm. Konsentrasilogamberat merkuripada sedimenmemilikikisaranrata­ratasebesar0,134­0,874ppm dan dibawah baku mutu sedimen berdasarkan ANZECC/AMRCANZ (2000) sebesar 1,0 ppm. Konsentrasilogamberat merkuripada kerang Polymesoda erosamemilikikisaranrata­ratasebesar0,123­0,206 ppm dan dibawah Batasan Maksimum Cemaran Logam Berat Dalam Pangan merujuk pada Standar Nasional Indonesia (SNI) No. 7387 Tahun 2009 sebesar 1,0 ppmABSTRACT The Waelata River and the Anahoni River are the two rivers where trommel operates for the processing of gold material from Gunung Botak and Gogrea. By the river, mercury waste from the processing of trommel is transported through estuary which will ultimately pollute the waters of the Kayeli Bay. Polymesoda erosa shells are one type of shellfish that is often used in monitoring heavy metals of mercury, especially in the estuary region. This study aims to analyze the concentration of heavy metal mercury (Hg) in water, sediments and Polymesoda erosa shells in the Waelata River and Anahoni River in Buru Regency. The results showed that the concentration of mercury heavy metals in water in the Waelata River and Anahoni River were not detected at all research stations and were below sea water quality standard for marine biota based on Minister of Environment Decree No. 51 of 2004 which is 0.001 ppm. The concentration of mercury heavy metals in sediments has an average range of 0.1340.887 ppm and is below the sediment quality standard based on ANZECC/AMRCANZ (2000) of 1.0 ppm. The concentration of mercury heavy metals in Polymesoda erosa shells has an average range of 0.1230.206 mg/kg and under the Maximum Limit of Heavy Metal Contamination in Food refers to the Indonesian National Standard (SNI) No. 7387 of 2009 which is 1.0 ppm.
ANALISIS KANDUNGAN MERKURI (Hg) PADA PADA EKOSISTEM SUNGAI WAELATA DAN SUNGAI ANAHONI YANG TERDAMPAK AKTIFITAS PERTAMBANGAN EMAS DI PULAU BURU, MALUKU ., Irsan; Male, Yusthinus T.; Selanno, Debby A. J.
CHEMISTRY PROGRESS Vol 13, No 1 (2020)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.13.1.2020.29062

Abstract

Sungai Waelata dan Sungai Anahoni merupakan dua sungai tempat beroperasinya trommel untuk pengolahan material emas Gunung Botak dan Gogrea. Melalui aliran sungai, limbah merkuri hasil pengolahan trommel terangkut dan terbawa ke muara yang pada akhirnya akan mencemari perairan laut Teluk Kayeli. Kerang Polymesoda erosa merupakan salah satu jenis kerang yang sering digunakan dalam pemantauan logam berat merkuri, terutama pada wilayah muara sungai. Penelitian ini bertujuan untuk menganalisis kadar logam berat merkuri(Hg) pada air, sedimen dan kerang Polymesoda erosadi Muara Sungai Waelata dan Sungai Anahoni Kabupaten Buru. Hasil penelitian menunjukan konsentrasilogamberat merkuripada air di Muara Sungai Waelata dan Sungai Anahoni tidak terdeteksi di semua stasiun penelitian dan dibawah baku mutu air laut untuk biota laut berdasarkan Kepmen LH No. 51 Tahun 2004 sebesar 0,001 ppm. Konsentrasilogamberat merkuripada sedimenmemilikikisaranrata­ratasebesar0,134­0,874ppm dan dibawah baku mutu sedimen berdasarkan ANZECC/AMRCANZ (2000) sebesar 1,0 ppm. Konsentrasilogamberat merkuripada kerang Polymesoda erosamemilikikisaranrata­ratasebesar0,123­0,206 ppm dan dibawah Batasan Maksimum Cemaran Logam Berat Dalam Pangan merujuk pada Standar Nasional Indonesia (SNI) No. 7387 Tahun 2009 sebesar 1,0 ppmABSTRACT The Waelata River and the Anahoni River are the two rivers where trommel operates for the processing of gold material from Gunung Botak and Gogrea. By the river, mercury waste from the processing of trommel is transported through estuary which will ultimately pollute the waters of the Kayeli Bay. Polymesoda erosa shells are one type of shellfish that is often used in monitoring heavy metals of mercury, especially in the estuary region. This study aims to analyze the concentration of heavy metal mercury (Hg) in water, sediments and Polymesoda erosa shells in the Waelata River and Anahoni River in Buru Regency. The results showed that the concentration of mercury heavy metals in water in the Waelata River and Anahoni River were not detected at all research stations and were below sea water quality standard for marine biota based on Minister of Environment Decree No. 51 of 2004 which is 0.001 ppm. The concentration of mercury heavy metals in sediments has an average range of 0.1340.887 ppm and is below the sediment quality standard based on ANZECC/AMRCANZ (2000) of 1.0 ppm. The concentration of mercury heavy metals in Polymesoda erosa shells has an average range of 0.1230.206 mg/kg and under the Maximum Limit of Heavy Metal Contamination in Food refers to the Indonesian National Standard (SNI) No. 7387 of 2009 which is 1.0 ppm.
DFT Study of Leuco-Indigo and Indigo as Active Material in Dye-Sensitized Solar Cell Maahury, Mirella Fonda; Male, Yusthinus Thobias; Martoprawiro, Muhamad Abdulkadir
Molekul Vol 15, No 2 (2020)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (408.899 KB) | DOI: 10.20884/1.jm.2020.15.2.592

Abstract

Computational study of natural indigo has been carried out to get the optimized structure and electronic properties of two indigo at different pH. It has been found that indigo has the potential to be applied as active material in the dye-sensitized solar cell. Computational calculations are performed using Density Functional Theory (DFT) with B3LYP functional and 6-31G(d,p) for ground state geometry optimization and Time Dependent-Density Functional Theory (TD-DFT) for excited states single point calculation. All calculations are carried out in the gas phase. Geometry optimization results show that Indigo has a planar structure, whereas leuco-indigo structure is not planar. Leuco-indigo absorption wavelength is shorter than indigo. The density of HOMO and LUMO is spreading throughout the molecule. The density of electrons at LUMO extends to the anchoring group. Based on excitation energy, absorption wavelength, excitation composition, and HOMO-LUMO density, it can be concluded that indigo has the potential to be applied in dye-sensitized solar cell (DSSC)
ANALISIS KANDUNGAN FORMALIN PADA MIE BASAH PADA BEBERAPA LOKASI DI KOTA AMBON Yusthinus T Male; Lina I Letsoin; Netty A Siahaya
Majalah BIAM Vol 13, No 2 (2017): Majalah BIAM
Publisher : Balai Riset dan Standardisasi Industri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.739 KB) | DOI: 10.29360/mb.v13i2.3530

Abstract

Telah dilakukan penelitian untuk menganalisis kandungan formalin mie basah pada beberapa lokasi di Kota Ambon. Tujuan dari penelitian ini adalah untuk menentukan kandungan formalin pada mie basah. Penelitian ini menggunakan tiga tahap pengujian. Pada tahap awal, dilakukan uji fisik dan analisis kualitatif untuk  menentukan ada tidaknya formalin dan analisis kuantitatif digunakan untuk menentukan kadar formalin dalam mie basah. Dari pengamatan uji fisik, ditemukan dua dari empat belas sampel mie basah mengandung formalin  yaitu sampel J (Batu Merah) dan K (Mardika) karena tetap awet sampai tiga hari. Analisis kualitatif dengan pereaksi asam kromatofat tidak menunjukkan perubahan warna yang khas. Pada pengamatan uji fisik mie basah dua sampel yang mengandung formalin dilanjutkan dengan analisis kuantitatif menggunakan Spektrofotometri UV-Vis pada panjang gelombang 520 nm. Kadar formalin untuk sampel J (Batu Merah) sebesar 9,07 mg/kg dan sampel K (Mardika) sebesar 10,01 mg/kg. Sesuai syarat mutu mie basah pada SNI 01-2987-1992, mie basah tidak boleh mengandung formalin.
ANALISIS TINGKAT PENCEMARAN GAS CO, NO2, DAN SO2 PADA DAERAH BATU MERAH KOTA AMBON Yusthinus Thobias Male
Akta Kimia Indonesia Vol 6, No 1 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v6i1.8473

Abstract

Batu Merah Village is one of the villages in Ambon City which has the largest population and also the main route of transportation access to Ambon City so that the traffic density triggers smoke pollution. This research was conducted to determine the concentration of gas CO, NO2 and SO2 on Batu Merah Village. The results of this study indicate that the level of NO2 and SO2 gas is still below the quality standard, while the CO gas pollution level has exceeded the quality standard based on the Regulation of the State Minister of the Environment No. 12 of 2010.
Analisis Kandungan Merkuri (Hg) dan Kadar Klorofil Lamun Enhalus Acoroides Di Perairan Marlosso dan Nametek Kabupaten Buru Provinsi Maluku Nur Alim Natsir; Debby A.J. Selanno; Ch I Tupan; Yustinus T. Male
BIOSEL (Biology Science and Education): Jurnal Penelitian Science dan Pendidikan Vol 9, No 1 (2020): BIOSEL (Biology Science and Education): Jurnal Penelitian Science dan Pendidikan
Publisher : INSTITUT AGAMA ISLAM NEGERI AMBON

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.694 KB) | DOI: 10.33477/bs.v9i1.1321

Abstract

Seagrass is a type of vegetation that is able to live and develop well in coastal areas and is a habitat for several types of marine animals,such as sea cucumbers, sea urchins, starfish and sea urchins. Seagrass is an organism that is susceptible to pollution of the coastal environment such as mercury (Hg) so that it has an impact on the chlorophyll content of seagrass leaves. This study aims to determine the content of heavy metal Hg and its relationship with the chlorophyll content of seagrass Enhalus acoroides in the waters of Marlosso and Nametek in Buru District Maluku Province. The study was conducted in May 2018 and laboratory analysis was conducted in June 2018. Samples were taken at two stations namely Nametek Beach and Muos Sungai Marlosso. The results showed that the content of heavy metal Hg in roots> rhizoma> seagrass leaves. The content of heavy metals and seagrass chlorophyll content has a negative correlation where the Hg metal has a correlation of (r = - 0.97) and indicates that the higher the content of heavy metals will reduce the seagrass chlorophyll content
SINTESIS KOMPLEKS BERINTI GANDA Fe(II)-M(I-II) SEBAGAI SENYAWA MOLEKULER CERDAS Yusthinus T Male; Matheis F.J.D.P anasale; Abraham Mariwy
Molluca Journal of Chemistry Education (MJoCE) Vol 2 No 1 (2012): Molluca Journal of Chemistry Education (MJoCE)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/MJoCEvol2iss1pp10-16

Abstract

Kompleks Fe(II)-M(I-II) {(M(I)=Cu(I) dan M(II)=Ni(II)} dengan ligan bidentat 2,2’-dipiridilamin (dpa) dan ligan jembatan CN- telah berhasil disintesis. Kompleks yang terbentuk merupakan kompleks berinti ganda dengan rumus molekul [Fe(dpa)2]2Ni(CN)4}(BF4)2. Rumus molekul ini diperoleh dari analisis ion dan CHN. Karakterisasi dengan XRD mendukung keberadaan dua inti logam dalam kompleks. Pengukuran kerentanan magnet pada kompleks tersebut menunjukkan sifat paramagnet dengan momen magnet sebesar 6,38 BM